| Saap Construction LLC | Amarendranath Deshini | info@saapconstruction.com | (650) 245 7024 | GC, remodel, ADU | Newark · Alameda County | — | — |
| Saarman Construction Ltd | Henry Kwong-Hung Wong | — | (415) 749 2700 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Sabi Construction Incorporated | Andre Marc King | — | (510) 834 8778 | GC, remodel, ADU | Emeryville · Alameda County | — | — |
| Sae Marble & Granite Countertops | Sae Marble & Granite Countertops | — | (510) 688 0140 | Other | Hayward · Alameda County | — | — |
| Saehan Fire Protection INC | Ahmed Zubair | — | (510) 676 7437 | Other | Fremont · Alameda County | — | — |
| Safe Cone Zone INC | Eduardo Noveda Flores | — | (800) 676 1350 | Other | Hayward · Alameda County | — | — |
| Safe Enterprise | Safe Enterprise | — | (510) 219 8000 | Electricians | Alameda · Alameda County | — | — |
| Safe Glass & Windows INC | Djaffar Amenouche | — | (341) 799 5030 | Windows, patio, painters | Albany · Alameda County | — | — |
| Safe Haven Inspections | Safe Haven Inspections | ahmad@safehaveninspects.com | (209) 654-1800 | Inspectors | Alameda · Alameda County | — | — |
| Safeco Builders INC | Stephen Anthony Ferreira | — | (408) 638 7613 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| Safeshields Incorporated DBA M A Z & G D H | Edward Khalegh Hemmat | — | (510) 773 7100 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Safetight Security LLC | Jesus Jr Alvarez | info@safetightsecurity.com | (510) 439 9500 | Alarm and generators | Oakland · Alameda County | — | — |
| Safety Construction | Dzebic Fikret | — | (510) 326 6279 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Safety Garage Door INC | Ammar Khader Hanfieh | info@safetygaragedoor.com | (415) 375 1930 | Other | Hayward · Alameda County | — | — |
| Saga Carpentry | Saga Carpentry | — | (510) 576 9318 | Other | Hayward · Alameda County | — | — |
| Sage And Stone Landscaping | Sage And Stone Landscaping | — | (510) 520 2246 | Windows, patio, painters | Berkeley · Alameda County | — | — |
| Sai Fire & Safety | Sai Fire & Safety | — | (510) 677 8506 | Other | Dublin · Alameda County | — | — |
| Sal Tree Service | Avila Salvador | — | (650) 771 2134 | Tree | San Leandro · Alameda County | — | — |
| Salas Construction | Thomas John Salas | — | (510) 682 5809 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| Salazar Electric | Jesus Manuel Salazar | — | (925) 784 5166 | Electricians | Livermore · Alameda County | — | — |
| Salgado's Quality Tile | Salgado's Quality Tile | — | (510) 303 2437 | Other | Hayward · Alameda County | — | — |
| Salinas Glass | Salinas Glass | — | (510) 376 4983 | Windows, patio, painters | Fremont · Alameda County | — | — |
| Salvi Development And Consulting LLC | Joseph Jonathan Martinez | — | (415) 444 6652 | GC, remodel, ADU | Oakland · Alameda County | — | — |
| Salwan Property Management & Investments | Dharam Pal Salwan | — | (510) 209 6283 | Other roofers | Fremont · Alameda County | — | — |
| Salwan Property Management And Investments | Salwan Property Management And Investments | — | (510) 209 6283 | Other roofers | Fremont · Alameda County | — | — |
| Sam Chin | Sam Chin | — | (408) 921 0606 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| Sam's Electro Incorporated | Rana Ahmad Saad | — | (877) 768 5380 | Electricians | Fremont · Alameda County | — | — |
| Sam's Landscaping | Sam's Landscaping | — | (510) 750 6505 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Sam's Low Cost Hauling INC | Samuel Joseph Lecesene | — | (510) 967 8913 | Windows, patio, painters | Oakland · Alameda County | — | — |
| Sam's Signs - Neon & Electrical INC | Mohammed Shamsher Khan | — | (510) 481 1700 | Other | San Leandro · Alameda County | — | — |
| Samayoa Construction INC | Jairo Guanelji Samayoa Morales | info@samayoaconstruction.com | (510) 585 6933 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| Samayoa's Painting | Samayoa's Painting | — | (650) 218 5663 | Windows, patio, painters | Hayward · Alameda County | — | — |
| Same Day Air Conditioning & Heating | Muhammad Rubin Salem | — | (510) 887 5571 | HVAC | Hayward · Alameda County | — | — |
| Samson & Yikaalo Construction Co | Yikaalo Semere Gebreselassie | — | (510) 918 8747 | GC, remodel, ADU | Alameda · Alameda County | — | — |
| Samuel Gamble | Samuel Gamble | — | (510) 367 5238 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| San Andres Construction | Gres Martinez Rodrigo | sanandresapr@gmail.com | (925) 493 0887 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| San Francisco Fire Prevention INC | Antonio Nunez | admin@sanfranciscofireprevention.com | (510) 589 8897 | Other | San Leandro · Alameda County | — | — |
| San Francisco Fire Protection | San Francisco Fire Protection | — | (510) 780 0854 | Other | San Leandro · Alameda County | — | — |
| San Francisco One Construction | Thomas Oo Liang | — | (510) 371 5193 | GC, remodel, ADU | Fremont · Alameda County | — | — |
| San Francisco Sal Painting | San Francisco Sal Painting | — | (415) 684 4465 | Windows, patio, painters | Oakland · Alameda County | — | — |